Bi4O5Br2/CeO2 Composite with S-scheme Heterojunction: Construction and CO2 Reduction Performance

doi:10.15541/jim20230003

Abstract

Abstract:

One of the basic challenges of CO₂ photoreduction is to develop efficient photocatalysts. As an effective strategy, constructing heterostructure photocatalysts with intimate interfaces can enhance interfacial charge transfer for realizing high photocatalytic activity. Herein, a novel photocatalytic material, Bi₄O₅Br₂/CeO₂ composite fiber (B@C-x, x refers to the amount of reactant), was constructed by embeding CeO₂ nanofibers on Bi₄O₅Br₂ nanosheets via an electrospinning combined with hydrothermal method. Its composition, morphology and photoelectric properties were characterized. The results show that Bi₄O₅Br₂/CeO₂ heterojunction with appropriate Bi₄O₅Br₂ content can significantly improve the photocatalytic performance of CeO₂ nanofibers. Compared with pure Bi₄O₅Br₂ and CeO₂, B@C-2 exhibited the best photocatalytic activity under simulated sunlight. The Bi₄O₅Br₂/CeO₂exhibited improved photocatalytic CO₂ reduction performance with a CO generation rate of 8.26 μmol·h⁻¹·g⁻¹ without using any sacrificial agents or noble co-catalysts. This can be attributed to the tight interfacial bonding between Bi₄O₅Br₂ and CeO₂ and the formation of S-scheme heterojunction, which enables the efficient spatial separation and transfer of photogenerated carriers. This work provides a simple and efficient method for directional synthesis of Bi-based photocatalytic composites with S-scheme heterojunction and illustrates an applicable tactic to develop potent photocatalysts for clean energy conversion.

Key words: Bi₄O₅Br₂/CeO₂ composite fiber, heterojunction, photocatalytic CO₂ reduction, hydrothermal method

CLC Number:

O643

LI Yuejun, CAO Tieping, SUN Dawei. Bi₄O₅Br₂/CeO₂ Composite with S-scheme Heterojunction: Construction and CO₂ Reduction Performance[J]. Journal of Inorganic Materials, 2023, 38(8): 963-970.

Figures/Tables 7

Fig. 1 (a) XRD patterns and (b) magnified patterns of different samples

Fig. 2 XPS spectra of different samples (a) Total survey; (b) Bi4f; (c) Br3d; (d) Ce3d

Fig. 3 (a-d, f) SEM and (e) HRTEM images of different samples (a) CeO2; (b) Bi4O5Br2; (c) B@C-1; (d, e) B@C-2; (f) B@C-4

Fig. 4 (a) N2 adsorption-desorption isotherms with inset showing pore-size distributions and (b) CO2 adsorption of different samples

Fig. 5 Photoelectric performance of different samples (a) UV-Vis DRS spectra; (b) Tauc plots; (c) PL spectra; (d) Transient photocurrent responses; (e) EIS spectra; (f) M-S plots

Fig. 6 Photocatalytic performance of different samples (a) Photocatalytic CO2 reduction; (b) CO generation rate; (c) Stability test; (d) XRD patterns before and after 5 cycles photocatalyzation

Fig. 7 Schematic mechanism of photocatalytic CO2 reduction of B@C-2 sample (a) Type Ⅱ heterojunction; (b) S-scheme heterojunction

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Bi₄O₅Br₂/CeO₂ Composite with S-scheme Heterojunction: Construction and CO₂ Reduction Performance

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